Yon Marsh Phototrix/Alamy
If I were somehow able to create two negatively charged black holes, could they repel each other? Or does gravity always win?
Ron Dippold
San Diego, California, US
Gravity wins. Which is strange, because gravity is by far the weakest major force – the gravitational force between an electron and positron is 1043 weaker than the electromagnetic force between them. But while charged black holes are certainly theoretically possible, a negatively charged black hole will preferentially attract positively charged particles and repel negatively charged ones. This then increases its mass and lowers its negative charge. The takeaway is that…
